there are three ways in which you can claim tax exemption from long term capital gain.
1) Section 54: In case the asset transferred is a long term capital asset being a residential house, and if out of the capital gains, a new residential house is constructed within 3 years, or purchased 1 year before or 2 years after the date of transfer, then exemption on the LTCG is available on the amount of investment in the new asset to the extent of the capital gains.
If a taxpayer purchases/constructs a house and claims exemption under section 54 and then the new residential house property is transferred within a period of 3 years from the date of its acquisition/completion of construction, then the benefit granted under section 54 will be withdrawn.
2)the amount of capital gains not appropriated towards purchase or construction may be deposited in the Capital Gains Account Scheme of a public sector bank before the due date of filing of Income Tax Return. This amount should subsequently be used for purchase or construction of a new house within 3 years.
3) Section 54EC: It provides that if any long term capital asset is transferred and out of the consideration, investment in specified assets (any bond issued by National Highway Authority of India or by Rural Electrification Corporation redeemable after 3 years), is made within 6 months from the date of transfer, then exemption would be available as computed in Sec. 54EB. The Finance Act, 2007 has laid an annual ceiling of Rs. 50 lakh on the investment made under this section w.e.f. 1.4.2007.
your capital gain amounted to rs 39,06,587.
if you invest in your own business you cant claim tax exemption